- http://www.lasertech.com/TruSpeed-Laser-Speed-Gun.aspx
- http://pocketradar.com/blog/landing/baseball/
- http://www.lasertech.com/TruCAM-Laser-Speed-Gun.aspx
- http://auto.howstuffworks.com/car-driving-safety/safety-regulatory-devices/question396.htm
- http://radargun.umwblogs.org/antecedents/
http://resources.edb.gov.hk/physics/articleIE/lasergun/laserGun__e.htm